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Related Experiment Videos

Complex magnetohydrodynamic low-Reynolds-number flows.

Yu Xiang1, Haim H Bau

  • 1Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6315, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|August 26, 2003
PubMed
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This study demonstrates how patterned electrodes and magnetic fields create chaotic fluid flow for stirring in microfluidic devices. Alternating electric current patterns induce controlled chaotic advection and drift for passive tracers.

Area of Science:

  • Physics
  • Fluid Dynamics
  • Electromagnetism

Background:

  • Lorentz forces generated by electric currents in magnetic fields drive fluid motion.
  • Controlling electric currents via patterned electrodes allows for complex flow manipulation.
  • Microfluidic devices benefit from stirring methods that avoid mechanical components.

Purpose of the Study:

  • To theoretically and experimentally investigate magnetohydrodynamic (MHD) flows in a rectangular conduit.
  • To explore the induction of chaotic advection and Lagrangian drift using patterned electrodes.
  • To assess the utility of MHD-driven flows for stirring and tracer migration in micro-devices.

Main Methods:

  • Utilizing a rectangular conduit with transversely aligned, individually controlled electrodes.

Related Experiment Videos

  • Applying potentials to electrode groups A and C to induce opposing electric currents and transverse forces.
  • Subjecting the device to a uniform magnetic field to generate Lorentz forces.
  • Alternating between electrode patterns A and C to induce chaotic advection.

    • Main Results:

    • Patterned electrodes and magnetic fields successfully generated cellular convection (flow patterns A and C).
    • Alternating between patterns A and C induced Lagrangian chaos, demonstrating chaotic advection.
    • The spatially shifted flow patterns facilitated Lagrangian drift, enabling net migration of passive tracers.

    Conclusions:

    • Magnetohydrodynamic flows offer a method for inducing chaotic advection and stirring in microfluidic systems.
    • The described electrode patterning provides a controllable mechanism for fluid manipulation without moving parts.
    • This technique shows promise for applications requiring efficient mixing and transport in micro-scale devices.